KR100961260B1 - Apparatus and method for suppressing carrier feedthrough in quadrature modulator system - Google Patents

Abstract

The present invention relates to a carrier leakage compensation apparatus and method in an orthogonal modulation system.

To suppress and minimize carrier leakage, simple analog-based circuits simultaneously adjust the in-phase and quadrature baseband differential input DC voltage differences to zero or any minute voltage difference. Accordingly, carrier leakage can be suppressed using a simple analog carrier leakage compensation device, and a carrier leakage compensation device can be simply implemented using various quadrature modulators.

Quadrature Modulation System, Carrier, Leakage, Compensation, Modulator, Analog

Description

Apparatus and method for suppressing carrier feedthrough in quadrature modulator system in orthogonal modulation system

The present invention relates to an apparatus and a method for compensating carrier leakage in an orthogonal modulator and an orthogonal modulation system.

In general, an orthogonal modulator regards the DC voltage difference of the baseband differential input as 0 as an ideal voltage difference, and when the DC voltage difference is 0, no carrier leakage occurs. However, in actual quadrature modulators, the DC voltage difference of the baseband differential input is not zero, which is mixed with the local oscillation signal, causing finite carrier leakage.

Currently, even in an orthogonal modulator used in a system using an orthogonal modulation scheme, carrier leakage occurs, and the carrier leakage is caused by a DC voltage difference of the baseband differential input. In this case, carrier leakage occurs according to various quadrature modulators. For example, there is an orthogonal modulator with a minimum carrier leakage when the DC voltage difference is 0, while an orthogonal modulator with a minimum carrier leakage when the DC voltage difference shows a slight difference.

In order to suppress such leakage of a carrier, the digital compensation circuit is conventionally used. In other words, a digital compensation circuit that detects carrier leakage and compensates for carrier leakage by a comparator is driven, and carrier leakage is compensated by using a DC compensation signal through a digital-to-analog converter. However, such a method requires a lot of digital blocks, that is, a comparator, a digital-to-analog converter, a control signal generator, and the like together with an orthogonal modulator, which results in a complicated system structure.

In another conventional technique, there is a method of detecting a DC voltage error at an in-phase or quadrature input in a modulator and then compensating for leakage of a carrier wave through a bias current of a transistor performing a modulation operation. However, this method has a limitation in that it can be applied only when designing a quadrature modulator.

Another conventional technique is to suppress carrier leakage in in-phase and quadrature using correlators, integrators, and pseudo noise generators in the feedback path. However, there is a problem that the structure is very complicated to implement a device for suppressing carrier leakage in this way.

Accordingly, the present invention provides an apparatus for compensating carrier leakage occurring in a modulator output or a transmit output in an orthogonal modulation scheme system.

In addition, the present invention provides a method of adjusting a DC voltage difference using a carrier leakage compensation device.

Carrier leakage device which is a feature of the present invention for achieving the technical problem of the present invention,

An orthogonal modulator configured to output a leakage carrier signal for the in-phase path and the quadrature path generated by the difference between the first bias voltage and the second bias voltage and the first control voltage and the second control voltage; A coupler extracting a part of the leaked carrier signal from the leaked carrier signal; A detector configured to detect a magnitude of the extracted leak carrier signal, measure a carrier leak amount, and convert the leak carrier signal into a direct current signal; And a controller configured to output the first control voltage and the second control voltage, respectively, by comparing the output DC signal with a first reference voltage and a second reference voltage.

Carrier leakage method is another feature of the present invention for achieving the technical problem of the present invention,

Detecting a leakage carrier signal for an in-phase path and a quadrature path based on the first bias voltage and the second bias voltage; Calculating a leakage amount for the leak carrier signal and converting the leak carrier signal to a DC voltage; Alternately outputting the DC voltage at a predetermined cycle; Removing the periodicity with respect to any one of the alternating DC voltages and outputting the DC voltages; Comparing the DC voltage from which the periodicity is removed with the first reference voltage and the second reference voltage, and generating the first control voltage and the second control voltage from a comparison result; Determining whether the DC voltage and the first reference voltage of the detected leakage carrier signal match, and determining whether the DC voltage and the second reference voltage match; Blocking the feedback signal when the DC voltage and the first reference voltage and the DC voltage and the second reference voltage coincide with each other, and transferring the same reference voltage to a comparator input; And generating the first control voltage and the second control voltage using the same reference voltage, and applying the generated first control voltage and the second control voltage to the signals of the in-phase path and the signals of the quadrature path, respectively. Steps.

Therefore, carrier leakage can be suppressed using the simple analog carrier leakage compensation apparatus.

In addition, the carrier leakage compensation device may be simply implemented using various quadrature modulators in which the baseband differential input voltage difference requires zero or a slight voltage error.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. In addition, the terms “… unit”, “… unit”, “module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. have.

Throughout the specification, when a part is "connected" to another part, this includes not only "directly connected" but also "electrically connected" with another element in between. .

1 is a structural diagram of a carrier leakage compensation device according to an embodiment of the present invention.

As shown in FIG. 1, the carrier leakage compensator includes a plurality of switching units 100, 110, 700, and 800, a first differential amplifier 200, a second differential amplifier 210, and an orthogonal modulator 300. The power amplifier 400 includes a coupler 500, a detector 600, a first controller 900, and a second controller 910.

First, the plurality of transfer parts 100, 110, 700, and 800 refer to the first to fourth transfer parts in combination. Here, the first switching unit 100 switches the path between the in-phase signal of the baseband signal and the ground under the control of the compensation control signal (Compensation On / Off), and the second switching unit 110. V switches the path between the quadrature-phase signal of the baseband signal and ground according to the control of the compensation control signal.

Specifically, when the compensation control signal in the "On" state is input, the first switching unit 100 and the second switching unit 110 are connected to ground, and the first switching unit when the compensation control signal in the "Off" state is input. The unit 100 and the second switching unit 110 are connected to receive in-phase baseband signals and quadrature baseband signals, respectively.

In addition, the third switching unit 700 transfers the leakage carrier signal detected by the detector 600 to the first control unit 900 and the second control unit 910 according to the control of the compensation control signal. Here, the leakage carrier signal is a signal converted into a DC voltage. Specifically, when the compensation control signal in the "On" state is input, the leakage carrier signal is input to the first control unit 900 and the second control unit 910, and when the compensation control signal in the "Off" state is input, the leakage carrier signal is introduced. It doesn't work.

The fourth switching unit 800 transfers the DC voltage with respect to the leakage carrier signal to the first control unit 900 and the second control unit 910 periodically or sequentially. At this time, the selection signal (I / Q selection) for controlling the carrier leakage for the signal in the in-phase path or the carrier leakage for the signal in the quadrature path is input at an arbitrary period. Herein, in the embodiment of the present invention, each switching unit is described as being implemented as a switch, but is not necessarily limited thereto.

The first differential amplifier 200 and the second differential amplifier 210 output the first bias voltage Vbias_1 and the second bias voltage Vbias_2, and the first controller 900 and the second controller 910, respectively. The first control voltage I_offset control and the second control voltage Q_offset control are respectively supplied to the quadrature modulator 300. In addition, the in-phase and quadrature baseband signals output under the control of the compensation control signal of "Off" in the first switching unit 100 and the second switching unit 110 serve as a modulator. do.

The quadrature modulator 300 includes a first mixer 310, a second mixer 320, and an adder 300. The quadrature modulator 300 receives an in-phase and quadrature baseband signal output from the first and second differential amplifiers 200 and 210, and has an in-phase baseband signal having a phase difference of 90 °. And output a quadrature baseband signal as a quadrature modulated signal.

At this time, the DC voltage difference of each differential input of the in-phase and quadrature baseband signals input to the quadrature modulator 300 is input to the first mixer 310 and the second mixer 320, respectively, and the local oscillation signal cosωt, sinωt) respectively. This results in finite carrier leakage in the radio frequency path. Here, the functions of the first mixer 310, the second mixer 320, and the adder 300 are already known, and detailed descriptions thereof will be omitted in the embodiments of the present disclosure.

The power amplifier 400 receives the leaked carrier wave output from the quadrature modulator 300, amplifies the power, and transmits the amplified power to the antenna.

The coupler 500 is positioned between the power amplifier 400 and the antenna, and extracts some of the carrier signals amplified by the power amplifier 400 and transmitted through the transmission signal path to the antenna from the transmission signal path. Here, the carrier signal consists of a quadrature signal and an in-phase signal.

The signal extracted by the coupler 500 is introduced into the detector 600. In other words, the coupler 500 extracts the leaked carrier from the transmission signal path, so that the detector 600 can measure the leaked carrier signal, which is a radio frequency signal.

The detector 600 detects the size of the carrier extracted by the coupler 500 and measures the amount of leakage of the carrier. At this time, the detected leakage carrier signal is converted into a DC voltage.

The first control unit 900 and the second control unit 910 periodically or sequentially receive the leaked carrier signal detected from the fourth switching unit 800 to adjust the voltage difference generated between the in-phase signal and the quadrature signal. Outputs the necessary control voltage. In this case, the first control unit 900 and the second control unit 910 compare the received leakage carrier signal with the first reference voltage Vref_I and the second reference voltage Vref_Q, respectively.

Here, the first reference voltage Vref_I and the second reference voltage Vref_Q are differential DC error voltages of the in-phase baseband input signals and differential DC voltages of the quadrature phase baseband input signals, respectively, so that the carrier leakage can be minimized. It means the error voltage. In this case, since the first reference voltage Vref_I and the second reference voltage Vref_Q vary according to the characteristics of the component device, they may be changed according to the system design.

Next, the structures of the first control unit 900 and the second control unit 910 described with reference to FIG. 1 will be described with reference to FIG. 2.

2 is a detailed structural diagram of a carrier leakage compensation apparatus according to an embodiment of the present invention.

As shown in FIG. 2, the first control unit 900 and the second control unit 910 may be configured differently according to two methods. For example, the method may be divided into a method of sequentially operating in-phase and quadrature control, and a method of time-divisionally performing in-phase and quadrature control.

In the embodiment of the present invention, the in-phase / quadrature phase control will be described using the time division method as an example. Referring to the case of controlling the in-phase / quad phase signal in this manner, the first control unit 900 includes a first filter 901, a fifth switching unit 902, and a first comparator 903. And a first integrator 904. The second control unit 910 includes a second filter 911, a sixth switching unit 912, a second comparator 913, and a second integrator 914.

First, the first filter 901 receives a DC voltage with respect to the leakage carrier signal output from the fourth switching unit 800, and the second filter 911 receives the leakage carrier signal output from the fourth switching unit 800. Receive and average the DC voltage delivered at any period. In this case, the first filter 901 and the second filter 911 may use an RC filter, and the first filter 901 and the second filter 911 may be used only when the RC time constant is longer than the time division period. have. In this case, the DC voltage of the leakage carrier signal input to the first filter 901 and the second filter 911 is input to only one side according to the switching of the fourth switching unit 800.

The fifth switching unit 902 and the sixth switching unit 912 input leakage carrier signals averaged by the first filter 901 and the second filter 911, respectively, when a compensation control signal of the "On" state is applied. The first reference voltage Vref_I and the second reference voltage Vref_Q are respectively applied to the first comparator 903 and the second comparator 913.

The first comparator 903 and the second comparator 913 receive the leakage carrier signal detected by the detector 600, and then compare the first and second reference voltages Vref_I and Vref_Q. Here, the first reference voltage Vref_I and the second reference voltage Vref_Q refer to differential DC error voltages of the in-phase baseband input signals and differential DC error voltages of the quadrature phase baseband input signals to minimize carrier leakage. do.

The first integrator 904 and the second integrator 914 respectively compare the output values of the first comparator 903 and the second comparator 913, that is, the DC voltage of the leakage carrier signal and the first reference voltage Vref_I. The difference value and the difference value between the DC voltage of the leakage carrier signal and the second reference voltage Vref_Q are input, and the difference value is accumulated and output. At this time, the accumulated values are input to the first differential amplifier 200 and the second differential amplifier 210 described with reference to FIG. 1, respectively. In this case, the differential DC voltage of the baseband input that minimizes the leakage of the carrier may be set to 0 or an arbitrary value by the first reference voltage Vref_I and the second reference voltage Vref_Q.

Next, a circuit diagram for implementing the first controller and the second controller described with reference to FIG. 2 will be described with reference to FIG. 3.

3 is a circuit diagram of a carrier leakage compensation apparatus according to an embodiment of the present invention.

As shown in FIG. 3, the first filter 901 and the second filter 911 are implemented using one resistor R1 and R2 and one capacitor C3 and C4, respectively. In addition, the first and second comparators 903 and 913 and the first and second integrators 904 and 914 are configured using one operational amplifier OP1 and OP2.

At this time, the first end of the resistor (R1, R2) is connected to the output terminal of the fourth switching unit 800, the second end of the resistor (R1, R2) is connected to the input terminal of the operational amplifier (OP1, OP2) have. In addition, the second stage of the resistors R1 and R2 and one capacitor C3, C4 are connected, and the other side of the capacitors C3, C4 is grounded.

In the exemplary embodiment of the present invention, the comparator and the integrator are implemented using one operational amplifier, but are not necessarily limited thereto. One input terminal of the operational amplifier is connected to the output terminal of the filter, and the other input terminal receives a reference voltage.

Next, a method of compensating carrier leakage using a device for compensating carrier leakage having the above-described structure will be described with reference to FIG. 4. In this case, a carrier minimization operation driven to compensate for carrier leakage may be performed at the initial stage of the system, or may be performed whenever there is no input signal flowing into the apparatus.

4 is a flowchart of a carrier leakage compensation method according to an embodiment of the present invention.

As shown in FIG. 4, first, a plurality of switching parts are initialized to compensate for carrier leakage (S100). In the embodiment of the present invention by applying a compensation control signal of the ON "state to compensate the carrier leakage, by connecting the first switching unit 100 and the second switching unit 110 to the ground in-phase / quadrature baseband The input signal is not input, and the fifth switching part 902 and the sixth switching part 912 are opened, and the third switching part 700 is connected to the fourth switching part 600 so that the leakage carrier signal The fourth switching unit 800 may be input to the first control unit 900 and the second control unit 910 at a predetermined cycle, and the in-phase signal and the quadrature signal, which are leakage carrier signals, may be input to the feedback circuit. To be set.

Since the in-phase and quadrature input switches of the first switching unit 100 and the second switching unit 110 are connected to ground, only the first bias voltage Vbias_1 and the second bias voltage Vbias_2 are initially set to the first switching unit 100 and the second switching unit 110, respectively. It is input to the first differential amplifier 200 and the second differential amplifier 210 and compared with a predefined initial voltage value. In addition, when the control voltage is calculated in the first control unit 900 and the second control unit 910 based on the initially input bias voltage, not only the bias voltage but also the first control voltage I_offset Control and the second control voltage Q_offset Control. In addition, the first differential amplifier 200 and the second differential amplifier 210 are input together, which are transmitted to the quadrature modulator 300 through the differential amplifiers 200 and 210.

The quadrature modulator 300 modulates the leakage carrier generated by the difference between the first bias voltage and the second bias voltage and the first control voltage and the second control voltage into a radio frequency signal and outputs the radio frequency signal to the power amplifier 400. . The leakage carrier is amplified by the power amplifier 400 and input to the coupler 500. At this time, the procedure is already known, detailed description thereof will be omitted in the embodiment of the present invention.

The coupler 500 not only transfers the signal output from the quadrature modulator 300 to the antenna, but also extracts some power of the signal. Here, some power of the leaked carrier wave output from the quadrature modulator 300 is extracted (S110). The leaked carrier signal extracted from the coupler 500 is input to the detector 600, and the detector 600 calculates the amount of the leaked carrier signal input, and then converts the output into a DC voltage (S120). Thereafter, the detector 600 outputs the converted DC voltage to the third switching unit 700 which transmits the converted DC voltage to the feedback circuit.

Since the third switching part 700 is already connected according to the setting in step S100, the DC voltage flowing into the third switching part 700 is transferred to the fourth switching part 800 and the fourth switching part 800. ) Feedbacks the DC voltage and inputs it to the first filter 902 and the second filter 912 at an arbitrary period (S130). The DC voltage transmitted at an arbitrary period is averaged by removing periodicity from the first filter 901 and the second filter 902.

Thereafter, the first comparator 903 and the second comparator 913 compare the averaged and returned signals with the first reference voltage Vref_I and the second reference voltage Vref_Q, respectively, in which the degree of leakage of the carrier is minimized. (S150). The first integrator 904 and the second integrator 914 generate a control voltage by integrating the comparison result, and output the generated control voltage to the first differential amplifier 200 and the second differential amplifier 210, respectively. The converted control voltage is applied (S160).

If the feedback signal does not match the reference voltage, the first integrator 904 and the second integrator 914 repeat steps S110 to S160 described above. However, if the feedback signal coincides with the first reference voltage Vref_I and the second reference voltage Vref_Q, respectively, it is determined that the leakage amount of the carrier is minimum, and a compensation control signal of “Off” is input to input the fifth switching unit ( 902 and the sixth switching unit 912 are connected and the third switching unit 700 is opened to prevent the carrier from flowing (S180).

The first control voltage and the second control voltage generated by the first integrator 904 and the second integrator 914 are applied to the first differential amplifier 200 and the second differential amplifier 210, respectively. The carrier leakage may be minimized by adjusting a difference between the bias voltage input to the first differential amplifier 200 and the second differential amplifier 210. As such, steps S110 to S160 are repeated until the carrier leakage is minimized. In this case, the first reference voltage Vref_I and the second reference voltage Vref_Q vary depending on the characteristics of the quadrature modulator constituting the system.

In the next step S170, when it is determined that the leakage carrier signal for the in-phase / quadrature path has converged to the reference voltage value and the leakage amount of the carrier has been minimized, a compensation control signal of "Off" is input to the fifth switching unit 902 and The sixth cutouts 912 are connected to each other. The third switching unit 700 is opened to apply the same reference voltage to two input terminals of the first comparator 903 and the second comparator 913, respectively (S190).

In this case, the same signal may be a preset signal. Here, applying the same reference voltage to the two input terminals of each comparator means that the signals are equally input to the first comparator 903 and the second comparator 913 and have the same amount of +/− as the output. This is to cause a pulse to occur. This is to allow the first integrator 904 and the second integrator 914 that receive the pulse to output a constant control voltage without change from the control voltage outputted previously.

Accordingly, the pulses indicating that the reference voltage and the DC voltage have the same +/− amount are generated at the outputs of the first comparator 903 and the second comparator 913 (S200). This means that there is no difference between the reference voltage and the DC voltage, that is, there is no carrier leakage. At this time, a compensation control signal of “off” is inputted so that an in-phase / quadrature baseband signal flows into the system.

In other words, when the leaked carrier signal is present, the first comparator 903 and the second comparator 913 generate a pulse corresponding to + or-to indicate how much the leakage amount of the leaked carrier signal differs from the reference voltage. Integrate the output of this comparator to generate a control voltage. However, in the absence of carrier leakage, the first comparator 903 and the second comparator 913 generate pulses indicating the same amount of +/−.

The first integrator 904 and the second integrator 914 integrate and output the outputs of the first comparator 903 and the second comparator 913, whereby a constant control voltage is applied to the first differential amplifier 200 and It is applied to the second differential amplifier 210 (S210). This is to transfer a constant control voltage applied to the first differential amplifier 200 and the second differential amplifier 210 to the quadrature modulator 300.

In the embodiment of the present invention, a quadrature modulation system having a quadrature signal and an in-phase signal has been described as an example, but is not necessarily limited thereto.

The embodiments of the present invention described above are not only implemented by the apparatus and method but may be implemented through a program for realizing the function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded, The embodiments can be easily implemented by those skilled in the art from the description of the embodiments described above.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a structural diagram of a carrier leakage compensation device according to an embodiment of the present invention.

2 is a detailed structural diagram of a carrier leakage compensation apparatus according to an embodiment of the present invention.

3 is a circuit diagram of a carrier leakage compensation apparatus according to an embodiment of the present invention.

4 is a flowchart of a carrier leakage compensation method according to an embodiment of the present invention.

Claims (14)

An apparatus for compensating carrier leakage in an orthogonal modulation system, An orthogonal modulator for outputting a leakage carrier signal for the in-phase path and the quadrature path generated by the difference between the first bias voltage and the first control voltage and the difference between the second bias voltage and the second control voltage; A coupler extracting a part of the leaked carrier signal from the leaked carrier signal; A detector configured to detect a magnitude of the extracted leak carrier signal, measure a carrier leak amount, and convert the leak carrier signal into a direct current signal; A controller configured to output the first control voltage and the second control voltage, respectively, by comparing the output DC signal with a first reference voltage and a second reference voltage; And A switching unit for alternately providing the DC signal output by the detector to the controller in accordance with a preset period; Carrier leakage compensation device comprising a. The method of claim 1, The control unit, A first filter for removing and outputting periodicity of the DC signal; A second filter for removing and outputting periodicity of the DC signal; A first comparator comparing the DC signal from which the periodicity is removed with the first reference voltage and outputting a first comparison value; A second comparator comparing the DC signal from which the periodicity is removed with the second reference voltage and outputting a second comparison value; A first integrator generating a first voltage by accumulating the first comparison value output from the first comparator; A second integrator configured to receive and accumulate a second comparison value output from the second comparator to generate the second control voltage; The DC signal and the compensation control signal from which the periodicity is removed from the first filter are received, wherein the compensation control signal is a control signal for compensating carrier leakage for the first signal and the second signal. A first switching unit configured to apply a first reference voltage to the first comparator; And A second switching part configured to receive a signal from which the periodicity is removed from the second filter and the compensation control signal, and apply a second reference voltage to the second comparator based on the received signal; Carrier leakage compensation device comprising a. delete The method of claim 1, The transfer part, A first switching unit for switching the connection to the control unit with respect to the DC voltage detected by the detector; And A second switching unit configured to output the DC voltage to the controller at the predetermined period and to output information about the carrier leakage amount to the controller; Carrier leakage compensation device comprising a. The method of claim 1, The first control voltage is a voltage necessary for adjusting the voltage difference generated between the first DC voltage and the first reference voltage indicating the amount of carrier leakage generated by the in-phase path, And the second control voltage is a voltage necessary for adjusting a voltage difference generated between the second DC voltage and the second reference voltage representing the amount of carrier residuals generated by the quadrature path. The method of claim 5, The first reference voltage is a control voltage to minimize the amount of carrier leakage for the in-phase path, And the second reference voltage is a control voltage for minimizing the amount of carrier leakage for the quadrature path. The method of claim 1, A third switching unit for switching a path to receive one of a first input signal and an arbitrary signal of the in-phase path according to a state of a compensation control signal; A fourth switching unit for switching a path to receive one of a second input signal and an arbitrary signal of the quadrature path according to a state of a compensation control signal; A differential amplifier transferring the first control voltage and the second control voltage, the first bias voltage and the second bias voltage output from the controller to the quadrature modulator; And Power amplification unit for receiving the signal output from the quadrature modulator amplifies the power and outputs Carrier leakage compensation device further comprising. A method for compensating carrier leakage in an orthogonal modulation system, Detecting a leakage carrier signal for an in-phase path and a quadrature path based on the first bias voltage and the second bias voltage; Determining whether the DC voltage and the first reference voltage with respect to the detected leakage carrier signal match, and determining whether the DC voltage and the second reference voltage coincide; Blocking the feedback signal when the DC voltage and the first reference voltage and the DC voltage and the second reference voltage coincide with each other, and applying the same reference voltage to the comparator input; And Generating the first control voltage and the second control voltage using the same reference voltage, and applying the generated first control voltage and the second control voltage to the signals of the in-phase path and the signals of the quadrature path, respectively; Carrier leakage compensation method comprising a. The method of claim 8, The detecting step, Calculating a leakage amount for the leak carrier signal and converting the leak carrier signal to a DC voltage; Alternately outputting the DC voltage at a predetermined cycle; Removing the periodicity with respect to any one of the alternating DC voltages and outputting the DC voltages; And Comparing the DC voltage from which the periodicity is removed with the first reference voltage and the second reference voltage, and generating the first control voltage and the second control voltage from a comparison result; Carrier leakage compensation method comprising a. The method of claim 8, As a result of determining whether the DC voltage coincides with the first reference voltage, if the first DC voltage indicating the leakage rate of the carrier generated by the in-phase path among the DC voltages does not coincide with the first reference voltage, the first DC voltage Generating a first control voltage by integrating a difference between the first reference voltage and the first reference voltage; And As a result of determining whether the DC voltage coincides with the second reference voltage, if the second DC voltage indicating the leakage rate of the carrier generated by the quadrature path among the DC voltages does not coincide with the second reference voltage, the second DC voltage Generating a second control voltage by integrating a difference between the second reference voltage and the second reference voltage; Carrier leakage compensation method comprising a. The method of claim 10, The first control voltage is a voltage necessary for adjusting the voltage difference generated between the first DC voltage and the first reference voltage, And the second control voltage is a voltage necessary for adjusting a voltage difference generated between the second DC voltage and the second reference voltage. The method of claim 11, By using the first reference voltage and the second reference voltage, the difference between the first control voltage and the second control voltage is set to any one of 0 and an arbitrary value, respectively. Carrier leakage compensation method. An apparatus for compensating carrier leakage, A coupler for detecting some of the leaked carrier signals of the leaked carrier signals for the arbitrary signals based on the bias voltage; A detector which detects a magnitude of a leakage carrier with respect to the signal detected by the coupler, measures a carrier leakage amount, and converts the leakage carrier signal into a direct current signal; A controller which compares the DC signal with a preset reference voltage and outputs a control voltage; A differential amplifier for applying the control voltage output from the controller and the bias voltage; And Switching unit for switching the path to receive any one of the input signal and the arbitrary signal according to the state of the compensation control signal Carrier leakage compensation device comprising a. The method of claim 13, An orthogonal modulator that receives the control voltage and an arbitrary signal from the differential amplifier and outputs an orthogonal modulated signal; And Power amplification unit for receiving the quadrature modulated signal output from the quadrature modulator to amplify and output power Carrier leakage compensation device further comprising.

Images